It's just a big old bean shape
Draw 2 large circles near the top of the body
Outline the circles (kind of looks like an 8 on it's side) and add two ear shapes either side for the headband
Inside the large circles add in a few more circles for the irises and pupils. Don't forget to colour in the pupils!
Give him a big wide mouth by drawing the letter D on it's side and adding a stripey bar along the top for teeth
Draw 2 long ovals coming off his shoulders at an angle and link them up with some lines to make up the overalls. Add a box with a pointy bottom in the middle as a pocket.
Don't forget the Gru Industries logo on the pocket. It's a letter G made up of a C shape surrounded by four coloured in semi circles.
Just draw some long hot dog shapes with little bumpy fingery bits on the ends. Add a curved line on each arm to draw in the gloves.
Add a couple of stumpy rectangles with pointy ends at the bottom of the body. Again, add some curved lines for the top of his boots.
Just quickly had a couple of wispy lines on the top for hair
Start with the main colours...
Then add some shading with a darker colour along one side...
And finally add two small white dots in the pupils as little highlights! And you're done!